@article{25920, author = {{Padberg, Laura and Santandrea, Matteo and Rüsing, Michael and Brockmeier, Julian and Mackwitz, Peter and Berth, Gerhard and Zrenner, Artur and Eigner, Christof and Silberhorn, Christine}}, issn = {{1094-4087}}, journal = {{Optics Express}}, title = {{{Characterisation of width-dependent diffusion dynamics in rubidium-exchanged KTP waveguides}}}, doi = {{10.1364/oe.397074}}, year = {{2020}}, } @article{47956, abstract = {{Optically nonlinear Pb2B5O9X (X = Cl, Br) borate halides are an important group of materials for second harmonic generation (SHG). Additionally, they also possess excellent photocatalytic activity and stability in the process of dechlorination of chlorophenols, which are typical persistent organic pollutants. It would be of great interest to conduct in situ (photo‐) catalysis investigations during the whole photocatalytic process by SHG when considering them as photocatalytic materials. In order to get superior photocatalytic efficiency and maximum surface information, small particles are highly desired. Here, a low‐cost and fast synthesis route that allows growing microcrystalline optically nonlinear Pb2B5O9X borate halides at large quantities is introduced. When applying the ionothermal growth process at temperatures between 130 and 170 °C, microcrystallites with an average size of about 1 µm precipitate with an orthorhombic hilgardite‐like borate halide structure. Thorough examinations using powder X‐ray diffraction and scanning electron microscopy, the Pb2B5O9X microcrystals are indicated to be chemically pure and single‐phased. Besides, the Pb2B5O9X borate halides' SHG efficiencies are confirmed using confocal SHG microscopy. The low‐temperature synthesis route thus makes these borate halides a highly desirable material for surface studies such as monitoring chemical reactions with picosecond time resolution and in situ (photo‐) catalysis investigations.}}, author = {{Tan, Deming and Kirbus, Benjamin and Rüsing, Michael and Pietsch, Tobias and Ruck, Michael and Eng, Lukas M.}}, issn = {{1613-6810}}, journal = {{Small}}, keywords = {{Biomaterials, Biotechnology, General Materials Science, General Chemistry}}, number = {{23}}, publisher = {{Wiley}}, title = {{{Resource‐Efficient Low‐Temperature Synthesis of Microcrystalline Pb2B5O9X (X = Cl, Br) for Surfaces Studies by Optical Second Harmonic Generation}}}, doi = {{10.1002/smll.202000857}}, volume = {{16}}, year = {{2020}}, } @article{47958, abstract = {{High-fidelity periodic poling over long lengths is required for robust, quasi-phase-matched second-harmonic generation using the fundamental, quasi-TE polarized waveguide modes in a thin-film lithium niobate (TFLN) waveguide. Here, a shallow-etched ridge waveguide is fabricated in x-cut magnesium oxide doped TFLN and is poled accurately over 5 mm. The high fidelity of the poling is demonstrated over long lengths using a non-destructive technique of confocal scanning second-harmonic microscopy. We report a second-harmonic conversion efficiency of up to 939 %/W (length-normalized conversion efficiency 3757 %/Wcm²), measured at telecommunications wavelengths. The device demonstrates a narrow spectral linewidth (1 nm) and can be tuned precisely with a tuning characteristic of 0.1 nm/°C, over at least 40 °C without measurable loss of efficiency.}}, author = {{Zhao, Jie and Rüsing, Michael and Javid, Usman A. and Ling, Jingwei and Li, Mingxiao and Lin, Qiang and Mookherjea, Shayan}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{13}}, publisher = {{Optica Publishing Group}}, title = {{{Shallow-etched thin-film lithium niobate waveguides for highly-efficient second-harmonic generation}}}, doi = {{10.1364/oe.395545}}, volume = {{28}}, year = {{2020}}, } @article{47955, abstract = {{Quasi-phase-matched grating structures in lithium niobate waveguides with sub-micrometer periodicities will benefit the development of short-wavelength nonlinear optical devices. Here, we report on the reproducible formation of periodically poled domains in x-cut single-crystalline thin-film lithium niobate with periodicities as short as 600 nm. Shaped single-voltage poling pulses were applied to electrode structures that were fabricated by a combination of electron-beam and direct-writing laser lithography. Evidence of successful poling with good quality was obtained through second-harmonic microscopy and piezoresponse force microscopy imaging. For the sub-micrometer period structures, we observed patterns with a double periodicity formed by domain interactions and features with sizes <200 nm.}}, author = {{Zhao, Jie and Rüsing, Michael and Roeper, Matthias and Eng, Lukas M. and Mookherjea, Shayan}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{19}}, publisher = {{AIP Publishing}}, title = {{{Poling thin-film x-cut lithium niobate for quasi-phase matching with sub-micrometer periodicity}}}, doi = {{10.1063/1.5143266}}, volume = {{127}}, year = {{2020}}, } @article{47952, author = {{Zhao, Jie and Ma, Chaoxuan and Rüsing, Michael and Mookherjea, Shayan}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{High Quality Entangled Photon Pair Generation in Periodically Poled Thin-Film Lithium Niobate Waveguides}}}, doi = {{10.1103/physrevlett.124.163603}}, volume = {{124}}, year = {{2020}}, } @inproceedings{47959, author = {{Rüsing, Michael and Roeper, M. and Amber, Z. and Kirbus, B. and Eng, L.M. and Zhao, J. and Mookherjea, S.}}, booktitle = {{2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF)}}, publisher = {{IEEE}}, title = {{{Periodic Poling of X-Cut Thin-Film Lithium Niobate: The Route to Submicrometer Periods}}}, doi = {{10.1109/ifcs-isaf41089.2020.9234870}}, year = {{2020}}, } @article{33299, abstract = {{The aim of this study was to find out whether teaching how to search for literature would be more beneficial to students and teachers if done online through short videos rather than in person during course time. To find out whether online videos are more beneficial, two courses were asked to fill in questionnaires, one at the beginning and one at the end of the semester. One of the courses received the input online via videos and were given an exercise to put the newly learned skills to use, the other course served as a control group and learned how to search for literature during the course. The results show that while the difference between the two groups is not significant, the videos can still be regarded as being more beneficial than teaching the necessary skills during course time.}}, author = {{Hahn, Charlotte Anna}}, issn = {{ISSN 2199-8825}}, journal = {{die hochschullehre}}, keywords = {{E-Learning, information competence, literature, library, research}}, number = {{6}}, title = {{{Informationskompetenz durch E-Learning? Durch Lernvideos nach Literatur suchen}}}, year = {{2020}}, } @article{48054, author = {{Gretz, Daniela}}, issn = {{1865-8857}}, journal = {{Jahrbuch der Raabe-Gesellschaft}}, keywords = {{General Medicine}}, number = {{1}}, pages = {{120--146}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Zwischen romantischem Fragment und Skizze/n der Moderne. Zum medialen Realismus von Wilhelm Raabes "Wer kann es wenden?"}}}, doi = {{10.1515/raabe-2020-0009}}, volume = {{61}}, year = {{2020}}, } @inproceedings{46319, abstract = {{The detection of orchestrated and potentially manipulative campaigns in social media is far more meaningful than an- alyzing single account behaviour but also more challenging in terms of pattern recognition, data processing, and com- putational complexity. While supervised learning methods need an enormous amount of reliable ground truth data to find rather inflexible patterns, classical unsupervised learn- ing techniques need a lot of computational power to handle large amount of data. This makes them infeasible for real- time analysis. In this work, we demonstrate the applicability of text stream clustering for the real-time detection of coordi- nated campaigns.}}, author = {{Assenmacher, D and Adam, L and Trautmann, Heike and Grimme, C}}, booktitle = {{Proceedings of the Florida Artificial Intelligence Research Society Conference}}, title = {{{Towards Real-Time and Unsupervised Campaign Detection in Social Media}}}, year = {{2020}}, } @phdthesis{48272, abstract = {{In der Forschungsarbeit wird die Zeitungskommunikation des 18. Jahrhunderts aus sprachwissenschaftlicher Perspektive untersucht. Es wird gezeigt, wie sich das Textsortenrepertoire der Zeitung weiterentwickelte, welche sprachlichen Wandelprozesse stattfanden und wie die Zeitung übergreifend allmählich zu einem Massenmedium avancierte. Der textlinguistische Zugang auf die Zeitungssprache wird an den relevanten Stellen ergänzt durch einschlägige Erkenntnisse aus der historischen Presseforschung und der linguistischen Kulturanalyse. So wird etwa nachgezeichnet, wie sich die Zeitungsschreiber im Laufe des Jahrhunderts immer stärker von den Einflüssen der Kanzleisprachen lösten und Formulierungsstrategien etablierten, die auf die Anforderungen des journalistischen Berichtens abgestimmt waren. Mit diesen und weiteren Ergebnissen wird der Versuch angestellt, eine Forschungslücke der Sprachgeschichtsforschung zu schließen, in der die Zeitungen des 18. Jahrhunderts bisher lediglich randständig untersucht wurden.}}, author = {{Wille, Manuel}}, isbn = {{978-3-347-16354-6}}, keywords = {{text linguistics, newspaper, Hamburgischer Correspondent, Textlinguistik, Sprachgeschichte, Textsortenwandel, Korpuslinguistik}}, pages = {{450}}, publisher = {{tredition GmbH, Halenreie 40-44, 22359 Hamburg}}, title = {{{Die Tageszeitung des 18. Jahrhunderts auf dem Weg zum Massenmedium}}}, doi = {{10.17619/UNIPB/1-1079}}, volume = {{15}}, year = {{2020}}, } @book{48406, author = {{Wessel, Lena and Prediger, S. and Stein, A. and Wijers, M. and Jonker, V.}}, publisher = {{DZLM}}, title = {{{Language for Mathematics in Vocational Contexts. Handbook for teachers and facilitators}}}, year = {{2020}}, } @article{48432, author = {{Wille, Manuel}}, journal = {{Wörterbücher zur Sprach- und Kommunikationswissenschaft (WSK) Online, edited by Stefan J. Schierholz.}}, publisher = {{Berlin, Boston: De Gruyter}}, title = {{{Pressesprache}}}, year = {{2020}}, } @article{48431, author = {{Wille, Manuel}}, journal = {{Wörterbücher zur Sprach- und Kommunikationswissenschaft (WSK) Online, edited by Stefan J. Schierholz.}}, publisher = {{ Berlin, Boston: De Gruyter}}, title = {{{Zeitungsstil}}}, year = {{2020}}, } @article{48466, author = {{Jacke, Christoph}}, journal = {{Die Aufhebung}}, title = {{{So Far...From Now On # 6. }}}, year = {{2020}}, } @inproceedings{20505, abstract = {{Speech activity detection (SAD), which often rests on the fact that the noise is "more'' stationary than speech, is particularly challenging in non-stationary environments, because the time variance of the acoustic scene makes it difficult to discriminate speech from noise. We propose two approaches to SAD, where one is based on statistical signal processing, while the other utilizes neural networks. The former employs sophisticated signal processing to track the noise and speech energies and is meant to support the case for a resource efficient, unsupervised signal processing approach. The latter introduces a recurrent network layer that operates on short segments of the input speech to do temporal smoothing in the presence of non-stationary noise. The systems are tested on the Fearless Steps challenge database, which consists of the transmission data from the Apollo-11 space mission. The statistical SAD achieves comparable detection performance to earlier proposed neural network based SADs, while the neural network based approach leads to a decision cost function of 1.07% on the evaluation set of the 2020 Fearless Steps Challenge, which sets a new state of the art.}}, author = {{Heitkaemper, Jens and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}}, booktitle = {{INTERSPEECH 2020 Virtual Shanghai China}}, keywords = {{voice activity detection, speech activity detection, neural network, statistical speech processing}}, title = {{{Statistical and Neural Network Based Speech Activity Detection in Non-Stationary Acoustic Environments}}}, year = {{2020}}, } @article{48524, author = {{Hubner-Benz, Sylvia}}, issn = {{1742-5360}}, journal = {{International Journal of Entrepreneurial Venturing}}, keywords = {{Management of Technology and Innovation, Strategy and Management, Business and International Management}}, number = {{2}}, publisher = {{Inderscience Publishers}}, title = {{{When entrepreneurs become leaders: how entrepreneurs deal with people management}}}, doi = {{10.1504/ijev.2020.105571}}, volume = {{12}}, year = {{2020}}, } @article{48521, author = {{Rudic, Biljana and Hubner-Benz, Sylvia and Baum, Matthias}}, issn = {{2352-6734}}, journal = {{Journal of Business Venturing Insights}}, keywords = {{Management of Technology and Innovation, Business and International Management}}, publisher = {{Elsevier BV}}, title = {{{Hustlers, hipsters and hackers: Potential employees’ stereotypes of entrepreneurial leaders}}}, doi = {{10.1016/j.jbvi.2020.e00220}}, volume = {{15}}, year = {{2020}}, } @article{48523, author = {{Gales, Alina and Hubner-Benz, Sylvia}}, issn = {{1664-1078}}, journal = {{Frontiers in Psychology}}, keywords = {{General Psychology}}, publisher = {{Frontiers Media SA}}, title = {{{Perceptions of the Self Versus One’s Own Social Group: (Mis)conceptions of Older Women’s Interest in and Competence With Technology}}}, doi = {{10.3389/fpsyg.2020.00848}}, volume = {{11}}, year = {{2020}}, } @article{47919, abstract = {{AbstractWe examine whether and how political embeddedness influences financial reporting quality in China by investigating how government ownership and political connections affect Chinese listed firms’ choices of earnings management strategies. The results show that state‐owned enterprises (SOEs), and in particular, central SOEs, are more likely to substitute accrual‐based earnings management strategies with costlier but less detectable real earnings management strategies than non‐SOEs. The results also indicate that politically connected enterprises (PCEs) are more likely to employ less detectable real earnings management strategies than non‐PCEs, so much so that PCEs’ total earnings management level is higher than that of non‐PCEs.}}, author = {{Wang, Zhi and Braam, Geert and Reimsbach, Daniel and Wang, Jiaxin}}, issn = {{0810-5391}}, journal = {{Accounting & Finance}}, keywords = {{Economics, Econometrics and Finance (miscellaneous), Finance, Accounting}}, number = {{5}}, pages = {{4723--4755}}, publisher = {{Wiley}}, title = {{{Political embeddedness and firms’ choices of earnings management strategies in China}}}, doi = {{10.1111/acfi.12690}}, volume = {{60}}, year = {{2020}}, } @article{47918, author = {{Hahn, Rüdiger and Reimsbach, Daniel}}, issn = {{2168-1007}}, journal = {{Academy of Management Discoveries}}, number = {{1}}, pages = {{155--157}}, publisher = {{Academy of Management}}, title = {{{Bringing Signaling Theory to Intermediated Voluntary Disclosure. Commentary on “Detecting False Accounts in Intermediated Voluntary Disclosure” by Patrick Callery and Jessica Perkins}}}, doi = {{10.5465/amd.2020.0015}}, volume = {{7}}, year = {{2020}}, }